/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.zxing.client.android;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.hardware.Camera;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.preference.PreferenceManager;
import android.support.v7.app.AppCompatActivity;
import android.text.ClipboardManager;
import android.util.Log;
import android.util.TypedValue;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.Result;
import com.google.zxing.ResultMetadataType;
import com.google.zxing.ResultPoint;
import com.google.zxing.client.android.camera.CameraManager;
import com.google.zxing.client.android.history.HistoryActivity;
import com.google.zxing.client.android.history.HistoryItem;
import com.google.zxing.client.android.history.HistoryManager;
import com.google.zxing.client.android.result.ResultButtonListener;
import com.google.zxing.client.android.result.ResultHandler;
import com.google.zxing.client.android.result.ResultHandlerFactory;
import com.google.zxing.client.android.result.supplement.SupplementalInfoRetriever;
import com.google.zxing.common.Constants;
import com.google.zxing.util.ProjectorUtil;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.text.DateFormat;
import java.util.Collection;
import java.util.Date;
import java.util.EnumSet;
import java.util.Map;
import java.util.Set;

/**
 * This activity opens the camera and does the actual scanning on a background thread. It draws a
 * viewfinder to help the user place the barcode correctly, shows feedback as the image processing
 * is happening, and then overlays the results when a scan is successful.
 *
 * @author dswitkin@google.com (Daniel Switkin)
 * @author Sean Owen
 */
public class CaptureActivity extends AppCompatActivity implements SurfaceHolder.Callback {

    private static final String TAG = CaptureActivity.class.getSimpleName();

    private static final int SHARE_ID = Menu.FIRST;
    private static final int HISTORY_ID = Menu.FIRST + 1;
    private static final int SETTINGS_ID = Menu.FIRST + 2;
    private static final int HELP_ID = Menu.FIRST + 3;
    private static final int ABOUT_ID = Menu.FIRST + 4;

    private static final long DEFAULT_INTENT_RESULT_DURATION_MS = 1500L;
    private static final long BULK_MODE_SCAN_DELAY_MS = 1000L;

    private static final String PACKAGE_NAME = "com.google.zxing.client.android";
    private static final String PRODUCT_SEARCH_URL_PREFIX = "http://www.google";
    private static final String PRODUCT_SEARCH_URL_SUFFIX = "/m/products/scan";
    private static final String[] ZXING_URLS = {"http://zxing.appspot.com/scan", "zxing://scan/"};
    private static final String RETURN_CODE_PLACEHOLDER = "{CODE}";
    private static final String RETURN_URL_PARAM = "ret";

    public static final int HISTORY_REQUEST_CODE = 0x0000bacc;

    private static final Set<ResultMetadataType> DISPLAYABLE_METADATA_TYPES =
            EnumSet.of(ResultMetadataType.ISSUE_NUMBER,
                    ResultMetadataType.SUGGESTED_PRICE,
                    ResultMetadataType.ERROR_CORRECTION_LEVEL,
                    ResultMetadataType.POSSIBLE_COUNTRY);

    private CameraManager cameraManager;
    private CaptureActivityHandler handler;
    private Result savedResultToShow;
    private ViewfinderView viewfinderView;
    private TextView statusView;
    private View resultView;
    private Result lastResult;
    private boolean hasSurface;
    private boolean copyToClipboard;
    private IntentSource source;
    private String sourceUrl;
    private String returnUrlTemplate;
    private Collection<BarcodeFormat> decodeFormats;
    private String characterSet;
    private String versionName;
    private HistoryManager historyManager;
    private InactivityTimer inactivityTimer;
    private BeepManager beepManager;
    protected CharSequence displayContents;//扫描结果

    private final DialogInterface.OnClickListener aboutListener =
            new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialogInterface, int i) {
                    Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(getString(R.string.zxing_url)));
                    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
                    startActivity(intent);
                }
            };
    private ImageView ivClose;

    ViewfinderView getViewfinderView() {
        return viewfinderView;
    }

    public Handler getHandler() {
        return handler;
    }

    CameraManager getCameraManager() {
        return cameraManager;
    }


    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);

        Window window = getWindow();
        window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        setLayout();//设置布局文件

        hasSurface = false;
        historyManager = new HistoryManager(this);
        historyManager.trimHistory();
        inactivityTimer = new InactivityTimer(this);
        beepManager = new BeepManager(this);

//    PreferenceManager.setDefaultValues(this, R.xml.preferences, false);

//    showHelpOnFirstLaunch();
    }

    protected void setLayout() {
        setContentView(R.layout.capture);
    }

    @Override
    protected void onResume() {
        super.onResume();

        // CameraManager must be initialized here, not in onCreate(). This is necessary because we don't
        // want to open the camera driver and measure the screen size if we're going to show the help on
        // first launch. That led to bugs where the scanning rectangle was the wrong size and partially
        // off screen.
        viewfinderView = findViewById(R.id.viewfinder_view);

        cameraManager = new CameraManager(getApplication());

        viewfinderView.setCameraManager(cameraManager);

        resultView = findViewById(R.id.result_view);
        statusView = findViewById(R.id.status_view);
        ivClose = findViewById(R.id.ivClose);
        handler = null;
        lastResult = null;

        resetStatusView();

        SurfaceView surfaceView = findViewById(R.id.preview_view);
        setSurfaceViewTouchListener(surfaceView);
        SurfaceHolder surfaceHolder = surfaceView.getHolder();
        if (hasSurface) {
            // The activity was paused but not stopped, so the surface still exists. Therefore
            // surfaceCreated() won't be called, so init the camera here.
            initCamera(surfaceHolder);
        } else {
            // Install the callback and wait for surfaceCreated() to init the camera.
            surfaceHolder.addCallback(this);
            surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        }

        beepManager.updatePrefs();

        inactivityTimer.onResume();

        Intent intent = getIntent();

        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
        copyToClipboard = prefs.getBoolean(PreferencesActivity.KEY_COPY_TO_CLIPBOARD, true)
                && (intent == null || intent.getBooleanExtra(Intents.Scan.SAVE_HISTORY, true));

        source = IntentSource.NONE;
        decodeFormats = null;
        characterSet = null;
        ivClose.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                onBackPressed();
            }
        });
        if (intent != null) {

            String action = intent.getAction();
            String dataString = intent.getDataString();

            if (Intents.Scan.ACTION.equals(action)) {

                // Scan the formats the intent requested, and return the result to the calling activity.
                source = IntentSource.NATIVE_APP_INTENT;
                decodeFormats = DecodeFormatManager.parseDecodeFormats(intent);

                if (intent.hasExtra(Intents.Scan.WIDTH) && intent.hasExtra(Intents.Scan.HEIGHT)) {
                    int width = intent.getIntExtra(Intents.Scan.WIDTH, 0);
                    int height = intent.getIntExtra(Intents.Scan.HEIGHT, 0);
                    if (width > 0 && height > 0) {
                        cameraManager.setManualFramingRect(width, height);
                    }
                }

                String customPromptMessage = intent.getStringExtra(Intents.Scan.PROMPT_MESSAGE);
                if (customPromptMessage != null) {
                    statusView.setText(customPromptMessage);
                }

            } else if (dataString != null &&
                    dataString.contains(PRODUCT_SEARCH_URL_PREFIX) &&
                    dataString.contains(PRODUCT_SEARCH_URL_SUFFIX)) {

                // Scan only products and send the result to mobile Product Search.
                source = IntentSource.PRODUCT_SEARCH_LINK;
                sourceUrl = dataString;
                decodeFormats = DecodeFormatManager.PRODUCT_FORMATS;

            } else if (isZXingURL(dataString)) {

                // Scan formats requested in query string (all formats if none specified).
                // If a return URL is specified, send the results there. Otherwise, handle it ourselves.
                source = IntentSource.ZXING_LINK;
                sourceUrl = dataString;
                Uri inputUri = Uri.parse(sourceUrl);
                returnUrlTemplate = inputUri.getQueryParameter(RETURN_URL_PARAM);
                decodeFormats = DecodeFormatManager.parseDecodeFormats(inputUri);

            }

            characterSet = intent.getStringExtra(Intents.Scan.CHARACTER_SET);

        }
    }

    private static boolean isZXingURL(String dataString) {
        if (dataString == null) {
            return false;
        }
        for (String url : ZXING_URLS) {
            if (dataString.startsWith(url)) {
                return true;
            }
        }
        return false;
    }

    @Override
    protected void onPause() {
        if (handler != null) {
            handler.quitSynchronously();
            handler = null;
        }
        inactivityTimer.onPause();
        cameraManager.closeDriver();
        if (!hasSurface) {
            SurfaceView surfaceView = findViewById(R.id.preview_view);
            SurfaceHolder surfaceHolder = surfaceView.getHolder();
            surfaceHolder.removeCallback(this);
        }
        Constants.isWeakLight = false;
        super.onPause();
    }

    @Override
    protected void onDestroy() {
        inactivityTimer.shutdown();
        Constants.isWeakLight = false;
        super.onDestroy();
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            if (source == IntentSource.NATIVE_APP_INTENT) {
                setResult(RESULT_CANCELED);
                finish();
                return true;
            } else if ((source == IntentSource.NONE || source == IntentSource.ZXING_LINK) && lastResult != null) {
                restartPreviewAfterDelay(0L);
                return true;
            }
        } else if (keyCode == KeyEvent.KEYCODE_FOCUS || keyCode == KeyEvent.KEYCODE_CAMERA) {
            // Handle these events so they don't launch the Camera app
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        menu.add(Menu.NONE, SHARE_ID, Menu.NONE, R.string.menu_share)
                .setIcon(android.R.drawable.ic_menu_share);
        menu.add(Menu.NONE, HISTORY_ID, Menu.NONE, R.string.menu_history)
                .setIcon(android.R.drawable.ic_menu_recent_history);
        menu.add(Menu.NONE, SETTINGS_ID, Menu.NONE, R.string.menu_settings)
                .setIcon(android.R.drawable.ic_menu_preferences);
        menu.add(Menu.NONE, HELP_ID, Menu.NONE, R.string.menu_help)
                .setIcon(android.R.drawable.ic_menu_help);
        menu.add(Menu.NONE, ABOUT_ID, Menu.NONE, R.string.menu_about)
                .setIcon(android.R.drawable.ic_menu_info_details);
        return true;
    }

    // Don't display the share menu item if the result overlay is showing.
    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        super.onPrepareOptionsMenu(menu);
        menu.findItem(SHARE_ID).setVisible(lastResult == null);
        return false;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
        switch (item.getItemId()) {
            case SHARE_ID:
//        intent.setClassName(this, ShareActivity.class.getName());
//        startActivity(intent);
                return super.onOptionsItemSelected(item);
            case HISTORY_ID:
                intent = new Intent(Intent.ACTION_VIEW);
                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
                intent.setClassName(this, HistoryActivity.class.getName());
                startActivityForResult(intent, HISTORY_REQUEST_CODE);
                break;
            case SETTINGS_ID:
                intent.setClassName(this, PreferencesActivity.class.getName());
                startActivity(intent);
                break;
            case HELP_ID:
                intent.setClassName(this, HelpActivity.class.getName());
                startActivity(intent);
                break;
            case ABOUT_ID:
                AlertDialog.Builder builder = new AlertDialog.Builder(this);
                builder.setTitle(getString(R.string.title_about) + versionName);
                builder.setMessage(getString(R.string.msg_about) + "\n\n" + getString(R.string.zxing_url));
//        builder.setIcon(R.drawable.launcher_icon);
                builder.setPositiveButton(R.string.button_open_browser, aboutListener);
                builder.setNegativeButton(R.string.button_cancel, null);
                AlertDialog dialog = builder.show();
                ProjectorUtil.getInstance().addDialog(dialog);
                break;
            default:
                return super.onOptionsItemSelected(item);
        }
        return true;
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent intent) {
        if (resultCode == RESULT_OK) {
            if (requestCode == HISTORY_REQUEST_CODE) {
                int itemNumber = intent.getIntExtra(Intents.History.ITEM_NUMBER, -1);
                if (itemNumber >= 0) {
                    HistoryItem historyItem = historyManager.buildHistoryItem(itemNumber);
                    decodeOrStoreSavedBitmap(null, historyItem.getResult());
                }
            }
        }
    }

    private void decodeOrStoreSavedBitmap(Bitmap bitmap, Result result) {
        // Bitmap isn't used yet -- will be used soon
        if (handler == null) {
            savedResultToShow = result;
        } else {
            if (result != null) {
                savedResultToShow = result;
            }
            if (savedResultToShow != null) {
                Message message = Message.obtain(handler, R.id.decode_succeeded, savedResultToShow);
                handler.sendMessage(message);
            }
            savedResultToShow = null;
        }
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        if (holder == null) {
            Log.e(TAG, "*** WARNING *** surfaceCreated() gave us a null surface!");
        }
        if (!hasSurface) {
            hasSurface = true;
            initCamera(holder);
        }
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        hasSurface = false;
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

    }

    /**
     * A valid barcode has been found, so give an indication of success and show the results.
     *
     * @param rawResult The contents of the barcode.
     * @param barcode   A greyscale bitmap of the camera data which was decoded.
     */
    public void handleDecode(Result rawResult, Bitmap barcode) {
        inactivityTimer.onActivity();
        lastResult = rawResult;
        ResultHandler resultHandler = ResultHandlerFactory.makeResultHandler(this, rawResult);
        historyManager.addHistoryItem(rawResult, resultHandler);

        if (barcode == null) {
            // This is from history -- no saved barcode
            handleDecodeInternally(rawResult, resultHandler, null);
        } else {
            beepManager.playBeepSoundAndVibrate();
            drawResultPoints(barcode, rawResult);
            switch (source) {
                case NATIVE_APP_INTENT:
                case PRODUCT_SEARCH_LINK:
                    handleDecodeExternally(rawResult, resultHandler, barcode);
                    break;
                case ZXING_LINK:
                    if (returnUrlTemplate == null) {
                        handleDecodeInternally(rawResult, resultHandler, barcode);
                    } else {
                        handleDecodeExternally(rawResult, resultHandler, barcode);
                    }
                    break;
                case NONE:
                    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
                    if (prefs.getBoolean(PreferencesActivity.KEY_BULK_MODE, false)) {
                        Toast.makeText(this, R.string.msg_bulk_mode_scanned, Toast.LENGTH_SHORT).show();
                        // Wait a moment or else it will scan the same barcode continuously about 3 times
                        restartPreviewAfterDelay(BULK_MODE_SCAN_DELAY_MS);
                    } else {
                        handleDecodeInternally(rawResult, resultHandler, barcode);
                    }
                    break;
            }
        }
    }

    /**
     * Superimpose a line for 1D or dots for 2D to highlight the key features of the barcode.
     *
     * @param barcode   A bitmap of the captured image.
     * @param rawResult The decoded results which contains the points to draw.
     */
    private void drawResultPoints(Bitmap barcode, Result rawResult) {
        ResultPoint[] points = rawResult.getResultPoints();
        if (points != null && points.length > 0) {
            Canvas canvas = new Canvas(barcode);
            Paint paint = new Paint();
            paint.setColor(getResources().getColor(R.color.result_image_border));
            paint.setStrokeWidth(3.0f);
            paint.setStyle(Paint.Style.STROKE);
            Rect border = new Rect(2, 2, barcode.getWidth() - 2, barcode.getHeight() - 2);
            canvas.drawRect(border, paint);

            paint.setColor(getResources().getColor(R.color.result_points));
            if (points.length == 2) {
                paint.setStrokeWidth(4.0f);
                drawLine(canvas, paint, points[0], points[1]);
            } else if (points.length == 4 &&
                    (rawResult.getBarcodeFormat() == BarcodeFormat.UPC_A ||
                            rawResult.getBarcodeFormat() == BarcodeFormat.EAN_13)) {
                // Hacky special case -- draw two lines, for the barcode and metadata
                drawLine(canvas, paint, points[0], points[1]);
                drawLine(canvas, paint, points[2], points[3]);
            } else {
                paint.setStrokeWidth(10.0f);
                for (ResultPoint point : points) {
                    canvas.drawPoint(point.getX(), point.getY(), paint);
                }
            }
        }
    }

    private static void drawLine(Canvas canvas, Paint paint, ResultPoint a, ResultPoint b) {
        canvas.drawLine(a.getX(), a.getY(), b.getX(), b.getY(), paint);
    }

    // Put up our own UI for how to handle the decoded contents.
    private void handleDecodeInternally(Result rawResult, ResultHandler resultHandler, Bitmap barcode) {
        statusView.setVisibility(View.GONE);
        viewfinderView.setVisibility(View.GONE);
//    resultView.setVisibility(View.VISIBLE);

        ImageView barcodeImageView = (ImageView) findViewById(R.id.barcode_image_view);
        if (barcode == null) {
//      barcodeImageView.setImageBitmap(BitmapFactory.decodeResource(getResources(),
//          R.drawable.launcher_icon));
        } else {
            barcodeImageView.setImageBitmap(barcode);
        }

        TextView formatTextView = (TextView) findViewById(R.id.format_text_view);
        formatTextView.setText(rawResult.getBarcodeFormat().toString());

        TextView typeTextView = (TextView) findViewById(R.id.type_text_view);
        typeTextView.setText(resultHandler.getType().toString());

        DateFormat formatter = DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.SHORT);
        String formattedTime = formatter.format(new Date(rawResult.getTimestamp()));
        TextView timeTextView = (TextView) findViewById(R.id.time_text_view);
        timeTextView.setText(formattedTime);


        TextView metaTextView = (TextView) findViewById(R.id.meta_text_view);
        View metaTextViewLabel = findViewById(R.id.meta_text_view_label);
        metaTextView.setVisibility(View.GONE);
        metaTextViewLabel.setVisibility(View.GONE);
        Map<ResultMetadataType, Object> metadata = rawResult.getResultMetadata();
        if (metadata != null) {
            StringBuilder metadataText = new StringBuilder(20);
            for (Map.Entry<ResultMetadataType, Object> entry : metadata.entrySet()) {
                if (DISPLAYABLE_METADATA_TYPES.contains(entry.getKey())) {
                    metadataText.append(entry.getValue()).append('\n');
                }
            }
            if (metadataText.length() > 0) {
                metadataText.setLength(metadataText.length() - 1);
                metaTextView.setText(metadataText);
                metaTextView.setVisibility(View.VISIBLE);
                metaTextViewLabel.setVisibility(View.VISIBLE);
            }
        }

        TextView contentsTextView = (TextView) findViewById(R.id.contents_text_view);
        displayContents = resultHandler.getDisplayContents();
        contentsTextView.setText(displayContents);

        switchActivity(displayContents);

        // Crudely scale betweeen 22 and 32 -- bigger font for shorter text
        int scaledSize = Math.max(22, 32 - displayContents.length() / 4);
        contentsTextView.setTextSize(TypedValue.COMPLEX_UNIT_SP, scaledSize);

        TextView supplementTextView = (TextView) findViewById(R.id.contents_supplement_text_view);
//    supplementTextView.setText("");
//    supplementTextView.setOnClickListener(null);
        if (PreferenceManager.getDefaultSharedPreferences(this).getBoolean(
                PreferencesActivity.KEY_SUPPLEMENTAL, true)) {
            SupplementalInfoRetriever.maybeInvokeRetrieval(supplementTextView,
                    resultHandler.getResult(),
                    handler,
                    historyManager,
                    this);
        }

        int buttonCount = resultHandler.getButtonCount();
        ViewGroup buttonView = (ViewGroup) findViewById(R.id.result_button_view);
        buttonView.requestFocus();
        for (int x = 0; x < ResultHandler.MAX_BUTTON_COUNT; x++) {
            TextView button = (TextView) buttonView.getChildAt(x);
            if (x < buttonCount) {
                button.setVisibility(View.VISIBLE);
                button.setText(resultHandler.getButtonText(x));
                button.setOnClickListener(new ResultButtonListener(resultHandler, x));
            } else {
                button.setVisibility(View.GONE);
            }
        }

        if (copyToClipboard && !resultHandler.areContentsSecure()) {
            ClipboardManager clipboard = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
            clipboard.setText(displayContents);
        }
    }

    protected void switchActivity(CharSequence isbn) {
        Intent data = new Intent();
        data.putExtra("CaptureIsbn", isbn);
        setResult(RESULT_OK, data);
        finish();
    }

    // Briefly show the contents of the barcode, then handle the result outside Barcode Scanner.
    private void handleDecodeExternally(Result rawResult, ResultHandler resultHandler, Bitmap barcode) {
        viewfinderView.drawResultBitmap(barcode);

        // Since this message will only be shown for a second, just tell the user what kind of
        // barcode was found (e.g. contact info) rather than the full contents, which they won't
        // have time to read.
        statusView.setText(getString(resultHandler.getDisplayTitle()));

        if (copyToClipboard && !resultHandler.areContentsSecure()) {
            ClipboardManager clipboard = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
            clipboard.setText(resultHandler.getDisplayContents());
        }

        if (source == IntentSource.NATIVE_APP_INTENT) {

            // Hand back whatever action they requested - this can be changed to Intents.Scan.ACTION when
            // the deprecated intent is retired.
            Intent intent = new Intent(getIntent().getAction());
            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
            intent.putExtra(Intents.Scan.RESULT, rawResult.toString());
            intent.putExtra(Intents.Scan.RESULT_FORMAT, rawResult.getBarcodeFormat().toString());
            byte[] rawBytes = rawResult.getRawBytes();
            if (rawBytes != null && rawBytes.length > 0) {
                intent.putExtra(Intents.Scan.RESULT_BYTES, rawBytes);
            }
            Map<ResultMetadataType, ?> metadata = rawResult.getResultMetadata();
            if (metadata != null) {
                Integer orientation = (Integer) metadata.get(ResultMetadataType.ORIENTATION);
                if (orientation != null) {
                    intent.putExtra(Intents.Scan.RESULT_ORIENTATION, orientation.intValue());
                }
                String ecLevel = (String) metadata.get(ResultMetadataType.ERROR_CORRECTION_LEVEL);
                if (ecLevel != null) {
                    intent.putExtra(Intents.Scan.RESULT_ERROR_CORRECTION_LEVEL, ecLevel);
                }
                Iterable<byte[]> byteSegments = (Iterable<byte[]>) metadata.get(ResultMetadataType.BYTE_SEGMENTS);
                if (byteSegments != null) {
                    int i = 0;
                    for (byte[] byteSegment : byteSegments) {
                        intent.putExtra(Intents.Scan.RESULT_BYTE_SEGMENTS_PREFIX + i, byteSegment);
                        i++;
                    }
                }
            }
            sendReplyMessage(R.id.return_scan_result, intent);

        } else if (source == IntentSource.PRODUCT_SEARCH_LINK) {

            // Reformulate the URL which triggered us into a query, so that the request goes to the same
            // TLD as the scan URL.
            int end = sourceUrl.lastIndexOf("/scan");
            String replyURL = sourceUrl.substring(0, end) + "?q=" + resultHandler.getDisplayContents() + "&source=zxing";
            sendReplyMessage(R.id.launch_product_query, replyURL);

        } else if (source == IntentSource.ZXING_LINK) {

            // Replace each occurrence of RETURN_CODE_PLACEHOLDER in the returnUrlTemplate
            // with the scanned code. This allows both queries and REST-style URLs to work.
            if (returnUrlTemplate != null) {
                String codeReplacement = String.valueOf(resultHandler.getDisplayContents());
                try {
                    codeReplacement = URLEncoder.encode(codeReplacement, "UTF-8");
                } catch (UnsupportedEncodingException e) {
                    // can't happen; UTF-8 is always supported. Continue, I guess, without encoding
                }
                String replyURL = returnUrlTemplate.replace(RETURN_CODE_PLACEHOLDER, codeReplacement);
                sendReplyMessage(R.id.launch_product_query, replyURL);
            }

        }
    }

    private void sendReplyMessage(int id, Object arg) {
        Message message = Message.obtain(handler, id, arg);
        long resultDurationMS = getIntent().getLongExtra(Intents.Scan.RESULT_DISPLAY_DURATION_MS,
                DEFAULT_INTENT_RESULT_DURATION_MS);
        if (resultDurationMS > 0L) {
            handler.sendMessageDelayed(message, resultDurationMS);
        } else {
            handler.sendMessage(message);
        }
    }

    /**
     * We want the help screen to be shown automatically the first time a new version of the app is
     * run. The easiest way to do this is to check android:versionCode from the manifest, and compare
     * it to a value stored as a preference.
     */
    private boolean showHelpOnFirstLaunch() {
        try {
            PackageInfo info = getPackageManager().getPackageInfo(PACKAGE_NAME, 0);
            int currentVersion = info.versionCode;
            // Since we're paying to talk to the PackageManager anyway, it makes sense to cache the app
            // version name here for display in the about box later.
            this.versionName = info.versionName;
            SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
            int lastVersion = prefs.getInt(PreferencesActivity.KEY_HELP_VERSION_SHOWN, 0);
            if (currentVersion > lastVersion) {
                prefs.edit().putInt(PreferencesActivity.KEY_HELP_VERSION_SHOWN, currentVersion).commit();
                Intent intent = new Intent(this, HelpActivity.class);
                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
                // Show the default page on a clean install, and the what's new page on an upgrade.
                String page = lastVersion == 0 ? HelpActivity.DEFAULT_PAGE : HelpActivity.WHATS_NEW_PAGE;
                intent.putExtra(HelpActivity.REQUESTED_PAGE_KEY, page);
                startActivity(intent);
                return true;
            }
        } catch (PackageManager.NameNotFoundException e) {
            Log.w(TAG, e);
        }
        return false;
    }

    private void initCamera(SurfaceHolder surfaceHolder) {
        try {
            cameraManager.openDriver(surfaceHolder);
            // Creating the handler starts the preview, which can also throw a RuntimeException.
            if (handler == null) {
                handler = new CaptureActivityHandler(this, decodeFormats, characterSet, cameraManager);
            }
            decodeOrStoreSavedBitmap(null, null);
        } catch (IOException ioe) {
            Log.w(TAG, ioe);
            displayFrameworkBugMessageAndExit();
        } catch (RuntimeException e) {
            // Barcode Scanner has seen crashes in the wild of this variety:
            // java.?lang.?RuntimeException: Fail to connect to camera service
            Log.w(TAG, "Unexpected error initializing camera", e);
            displayFrameworkBugMessageAndExit();
        }
    }

    protected void displayFrameworkBugMessageAndExit() {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle(getString(R.string.barcode_canner_title));
        builder.setMessage(getString(R.string.msg_camera_framework_bug));
        builder.setPositiveButton(R.string.button_ok, new FinishListener(this));
        builder.setOnCancelListener(new FinishListener(this));
        AlertDialog dialog = builder.show();
        ProjectorUtil.getInstance().addDialog(dialog);
    }

    public void restartPreviewAfterDelay(long delayMS) {
        if (handler != null) {
            handler.sendEmptyMessageDelayed(R.id.restart_preview, delayMS);
        }
        resetStatusView();
    }

    private void resetStatusView() {
        resultView.setVisibility(View.GONE);
        statusView.setText(R.string.msg_default_status);
        // statusView.setVisibility(View.VISIBLE);
        viewfinderView.setVisibility(View.VISIBLE);
        lastResult = null;
    }

    public void drawViewfinder() {
        viewfinderView.drawViewfinder();
    }

    private float oldDist = 1f;

    private void setSurfaceViewTouchListener(SurfaceView surfaceView) {
        surfaceView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                if (event.getPointerCount() > 1) {
                    switch (event.getAction() & MotionEvent.ACTION_MASK) {
                        case MotionEvent.ACTION_POINTER_DOWN:
                            oldDist = getFingerSpacing(event);
                            break;
                        case MotionEvent.ACTION_MOVE:
                            float newDist = getFingerSpacing(event);
                            if (newDist > oldDist) {
                                handleZoom(true);
                            } else if (newDist < oldDist) {
                                handleZoom(false);
                            }
                            oldDist = newDist;
                            break;
                    }
                }
                return true;
            }
        });
    }

    private static float getFingerSpacing(MotionEvent event) {
        float x = event.getX(0) - event.getX(1);
        float y = event.getY(0) - event.getY(1);
        return (float) Math.sqrt(x * x + y * y);
    }

    private void handleZoom(boolean isZoomIn) {
        Camera camera = CameraManager.getCamera();
        if (camera == null) return;
        Camera.Parameters params = camera.getParameters();
        if (params.isZoomSupported()) {
            int maxZoom = params.getMaxZoom();
            int zoom = params.getZoom();
            if (isZoomIn && zoom < maxZoom) {
                zoom++;
            } else if (zoom > 0) {
                zoom--;
            }
            params.setZoom(zoom);
            camera.setParameters(params);
        } else {
            Log.i(TAG, "zoom not supported");
        }
    }
}
